Understanding a Storm
Tropical disturbance: An area of
disturbed weather in the tropics.
Tropical Depression: A low-pressure
area in the tropics with a surface wind less than 38 mph.
Tropical Storm: Surface winds of
39 - 74 mph.
Hurricane: Surface winds greater
than 75 mph.
Hurricane Watch: Issued when a hurricane
or tropical storm may threaten an area within 24 hours. This does not indicate
immediate danger, but is an alert to caution residents and emergency forces in
the area. When your area is under a "Watch," continue normal
activities, but stay tuned to the radio or television for all weather service
advisories.
Hurricane Warning: Issued when it
is expected the hurricane or tropical storm will strike an area within 24
hours. The area is expected to feel the hurricane or tropical storm.
Precautions should be taken immediately.
NOAA Hurricane Basics
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